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      01-17-2013, 07:47 AM   #8
phil200tdi
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Drives: 335i M Sport E90 LCI manual
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All depends on how aggressive you want to be.

14.5psi (map2) 400bhp ish
17psi (Map5) 420-430bhp ish

With a G5 ISO board you could get higher boost but start to risk Knock without Meth. Depends on Octane and environmental conditions too.
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